title: Temperature and composition dependence of kinetics of phase separation in solid binary mixtures.
abstract: We present results on the effects of temperature variation and composition in the kinetics of phase separation in solid binary mixtures (A1 + A2) from Monte Carlo simulations of the Ising model in two dimensions. The simulation results are understood via an appropriate application of the finite-size scaling theory. At moderately high temperatures, for symmetric (50 : 50) compositions of A1 and A2 particles the average size of the domains exhibits power-law growth with the exponent having a Lifshitz-Slyozov value of 1/3 from very early time. However, our analysis shows that for low enough temperatures, the growth exponent at an early time is smaller than the Lifshitz-Slyozov value. For composition dependence, we find that at moderate temperature, even for extreme off-critical composition, the curvature dependent correction to the growth law is weak which is counter-intuitive in case of droplet morphology. This is, however, consistent with the recent understanding on the curvature dependence of surface tension. Results from rather general studies on the finite-size effects with the variations of temperature and composition have also been presented.
authors.affiliation: Theoretical Sciences Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur PO, Bangalore 560064, India.
authors.forename: Suman
authors.initials: S
authors.lastname: Majumder
authors.forename: Subir K
authors.initials: SK
authors.lastname: Das
mesh_terms: D007700:Kinetics; D056004:Molecular Dynamics Simulation; D009010:Monte Carlo Method; D013696:Temperature